Research on Effective Factors of Heat Transfer of Thin Heating Floor

2012 ◽  
Vol 446-449 ◽  
pp. 2920-2923
Author(s):  
Quan Ying Yan ◽  
Li Li Jin ◽  
Ran Zhou ◽  
Sui Lin Wang
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Air Temperature ◽  
Transfer Process ◽  
Indoor Air ◽  
Heat Transfer Process ◽  
Hot Water ◽  
Effective Factors ◽  
Average Temperature ◽  
Surface Temperature Distribution

In this paper, numerical simulations of heat transfer process in thin heating floor were done by ANSYS. The influence of tube spacing, the average temperature of hot water and indoor air temperature on surface temperature distribution of heating floor and heat density were analyzed. The results can provide reference and basis for optimization, application and promotion of the thin heating floor.

scholarly journals CFD SIMULATION OF THE HEAT TRANSFER PROCESS IN A CHEVRON PLATE HEAT EXCHANGER USING THE SST TURBULENCE MODEL

2015 ◽  
Vol 55 (4) ◽  
pp. 267 ◽  
Author(s):  
Jan Skočilas ◽  
Ievgen Palaziuk
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Transfer Process ◽  
Cfd Simulation ◽  
Numerical Study ◽  
Analytical Calculation ◽  
Heat Transfer Process ◽  
Plate Heat Exchanger ◽  
Hot Water ◽  
Plate Heat

<p>This paper deals with a computational fluid dynamics (CFD) simulation of the heat transfer process during turbulent hot water flow between two chevron plates in a plate heat exchanger. A three-dimensional model with the simplified geometry of two cross-corrugated channels provided by chevron plates, taking into account the inlet and outlet ports, has been designed for the numerical study. The numerical model was based on the shear-stress transport (SST) <em>k-!</em> model. The basic characteristics of the heat exchanger, as values of heat transfer coefficient and pressure drop, have been investigated. A comparative analysis of analytical calculation results, based on experimental data obtained from literature, and of the results obtained by numerical simulation, has been carried out. The coefficients and the exponents in the design equations for the considered plates have been arranged by using simulation results. The influence on the main flow parameters of the corrugation inclination angle relative to the flow direction has been taken into account. An analysis of the temperature distribution across the plates has been carried out, and it has shown the presence of zones with higher heat losses and low fluid flow intensity.</p>

scholarly journals Modeling of the heat transfer process in an air heat pump fanless evaporator

2018 ◽  
Vol 240 ◽  
pp. 05012
Author(s):  
Piotr Kopeć ◽  
Beata Niezgoda-Żelasko
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Mixed Convection ◽  
Heat Pump ◽  
Transfer Process ◽  
Experimental Studies ◽  
Heat Transfer Process ◽  
Cfd Modeling ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

This paper analyses the mixed convection process in a fanless evaporator of an air heat pump. The text of the paper shows the authors’ experimental studies results of the temperature distribution and the local values of heat transfer coefficients on the outer surface of vertical tubes with longitudinal fins for the case of mixed convection and fins of a specific shape of their cross-section (prismatic, wavy fins). The experimental studies include the air velocities wa=2,3 m/s and the temperature differences between air and the refrigerant inside the heat exchanger tubes which is ΔT=24-40K. The results obtained were used for verification of CFD modeling of the heat transfer process for the discussed case of heat transfer and the geometry of the finned surface. The numerical analysis was performed for: the temperature distribution along the fin height, the tube perimeter and height, the distribution of local heat transfer coefficients on the finned tube perimeter and along its height. The simulated calculations were used to verify the method of determination of fin efficiency.

The Research on the Heat Transfer Process of Low Temperature Hot Water Radiant Heating Phase Change Wallboard

2013 ◽  
Vol 800 ◽  
pp. 18-21
Author(s):  
Quan Ying Yan ◽  
Li Hang Yue ◽  
Ran Huo
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Low Temperature ◽  
Phase Change ◽  
Physical Model ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Hot Water ◽  
Radiant Heating ◽  
Heating Phase

In this paper, physical model and mathematical model of the hot water radiant heating phase change wallboard were built. The heat transfer process of wallboard was simulated to analyze different influencing factors and optimize the design of the hot water heating phase change wallboard. The research results can provide reference and basis to the optimization of low temperature hot water radiant heating phase change wallboard.

Controlled Temperature Distribution and Heat Transfer Process in the Unidirectional Solidification of Aluminium Alloys

2012 ◽  
Vol 188 ◽  
pp. 314-317
Author(s):  
Florin Ştefănescu ◽  
Gigel Neagu ◽  
Alexandrina Mihai ◽  
Iuliana Stan
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Thermal Conditions ◽  
Solidification Process ◽  
Heat Transfer Process ◽  
Solidification Structure ◽  
Major Influence ◽  
Cast Material

Abstract. The paper presents some theoretical and experimental data regarding the directional solidification, revealing the main factors (especially those which are related to the heat transfer process) which have influence on the crystals size and morphology. The crystalline structure of alloys is determined by three important factors: chemical composition, thermal conditions, and characteristics of germination and growth from liquid of solid nuclei. The solidification structure can be influenced by acting on the mould properties or directly on the cast material, both of these actions being based upon the change of temperature distribution in the alloy-mould system. Experimental data demonstrated the major influence of the thermal regime on the crystallization-solidification process, on the transcrystallization zone and they pointed out the limits to direct the crystals formation (size and shape) by changing the cooling regime.

Study on Temperature Distribution of Plasma Surface Alloying Furnace

2008 ◽  
Vol 575-578 ◽  
pp. 633-638
Author(s):  
Zhong Hou Li ◽  
Sha Sha Liu ◽  
Zhi Yong Cheng
Keyword(s):  
Heat Transfer ◽  
Numerical Calculation ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Calculation Results ◽  
Heat Preservation ◽  
Plasma Surface Alloying

The objective of this research was to develop methods for improved the uniformity of temperature distribution within plasma surface alloying furnace by simulating the heat transfer process and numerical calculation. Results show that the structure of charging basket, hanging auxiliary cathode plates in both sides of charging basket and blackness of material influence strongly temperature distribution within the plasma surface alloying furnace. Discharge intensity of the center zone can be weakened through increasing the distance between backs both column blades in center of the furnace, which decreased the consumption of discharge power in center, depressed temperature of the center zone of the furnace. Intensity of discharge in fringe of the charging basket can be reinforced and that of discharge in center can be weakened when auxiliary cathode plates were hanged to outer flank of the charging basket, which increased boundary temperature of the system, at the same time the auxiliary cathode plate plays a heat preservation role. Decreasing the blackness of outside material of charging basket may decrease heat dissipating capacity of outside, decrease temperature difference of outside and center of the furnace and improve the uniform of temperature distribution in the furnace.

Simulation Analysis of Heat Transfer on Low Temperature Hot-Water Radiant Floor Heating and Electrical Radiant Floor Heating

2012 ◽  
Vol 204-208 ◽  
pp. 4234-4238
Author(s):  
Han Bing Qi ◽  
Fu Yun He ◽  
Qiu Shi Wang ◽  
Dong Li ◽  
Lin Lin
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Low Temperature ◽  
Heating System ◽  
Heat Transfer Process ◽  
Hot Water ◽  
Radiant Heating ◽  
Radiant Floor Heating ◽  
Heating Mode ◽  
Floor Heating

Radiant floor heating as a new type of energy-saving heating method has more and more used in modern building heating project. According to the different heat source, radiant floor heating is divided into low temperature hot-water floor radiant heating and electrical floor radiant heating. This paper analyzes the heat transfer process of structure layer of the low temperature hot-water and electrical floor radiant heating system, establishes two dimensional steady heat transfer mathematic model, numerical calculation using Fluent software. Respectively simulated when floor materials is different, the heat transfer process of low temperature hot-water floor radiant heating and electrical floor radiant heating system, The analysis results show that: for low temperature hot-water floor radiant heating, when floor material is soft wood, the ground temperature distribution is more uniform; for electrical floor radiant heating, when floor materials is marble, the ground temperature distribution is more uniform; electrical floor radiant heating is more energy saving, and temperature distribution in the ground of floor using the constant heat flux electric heating mode is more uniform than which using the low temperature hot water heating mode.

Research on Temperature Distribution for Tubing Liquid with Hot Natural Gas Injected Annulus Using Gas Lift

2014 ◽  
Vol 496-500 ◽  
pp. 1084-1087
Author(s):  
Luo Wei ◽  
Rui Quan Liao ◽  
Yong Li ◽  
Jian Wu
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Natural Gas ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Prediction Methods ◽  
Fluid Temperature ◽  
Temperature Prediction ◽  
Conservation Of Energy ◽  
Gas Lift

In light of the difficulty including the complicacy of heat transfer process with hot natural gas injected in gas lift annulus, regular temperature prediction methods are commonly used to consider the tubing fluid temperature for the heat transfer from tubing to annulus, actually the tubing fluid will not be the external heat transfer but it will be heated by annulus when the gas temperature in annulus is higher than the tubing fluid temperature, as well as especially the prediction of tubing wellhead temperature in terms of fluid temperature distribution traits in annulus and tubing, regular temperature prediction methods manifest limitation due to their applicability. Based on the fairly comprehensive tubing fluid temperature distribution prediction model with consideration of Thomson effect and such factors as kinetic energy, annular convection heat transfer and phase change etc. developed by the predecessors, and according to the basic principle of conservation of energy and heat transfer, the actual heat transfer process with hot natural gas injected in gas lift annulus was considered as a plus in this paper. The models for actual heat transfer and tubing fluid modified temperature prediction were established and eventually, the models were verified via multiple field tests. The reliability, capable of satisfying the requirements of engineering precision, in terms of temperature distribution of model prediction was proved.

scholarly journals Analysis of temperature distribution in the heating boiler equipped with afterburning chamber

2019 ◽  
Vol 128 ◽  
pp. 01009
Author(s):  
Wojciech Judt ◽  
Bartosz Ciupek ◽  
Rafał Urbaniak
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Solid Fuel ◽  
Heat Transfer Process ◽  
Heating Device ◽  
Afterburning Chamber ◽  
Vertical Tubes ◽  
Heating Boiler

Analysis of a heat transfer process for construction of solid fuel heating boiler equipped with additional afterburning chamber is presented. Analyzed construction of the heating device is intended for shouse heating and preparation of hot utility water. A heat exchanger in the analyzed boiler is composed of vertical tubes divided into three boiler draughts. Afterburning chamber connects main combusting chamber of the heating boiler with second and third boiler draught. The aim of this analysis is to identify the character of heat transfer through the heating boiler

The Simulation and Analysis of Heat Transfer Process of Honeycomb Regenerator

2011 ◽  
Vol 130-134 ◽  
pp. 1810-1815 ◽  
Author(s):  
Ye Tian ◽  
Xun Liang Liu ◽  
Zhi Wen ◽  
Xiao Hong Feng ◽  
Zhi Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Rational Design ◽  
Distribution Curve ◽  
Mathematic Model ◽  
Heat Transfer Process ◽  
Structure Parameter ◽  
Regenerative Burner ◽  
Ceramic Honeycomb

On the basis of established mathematic model of regenerator heat transfer process, the process of heat transfer of ceramic honeycomb regenerator with the method of simulation is studied. The temperature distribution curve of regenerator and gas is obtained, the temperatures curve of regenerator and gas are closely related to time is investigated ,and the influence of operation and structure parameter to heat transfer of regenerator is discussed. All this work is to provide guides of rational design of single-ended regenerative burner.

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